Many racers and engine tuners have opted for state-of-the-art diagnostic equipment but have forgotten one of the simplest, as well as one of the most accurate tuning tools...... the vacuum gauge.

When using any vacuum gauge keep in mind that they are all calibrated at sea level and read-outs in the instructions are in reference to that level. When above sea level all readings will drop one division per each 1,000 feet of altitude above sea level. Thus a reading of 20 inches of...​
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